From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Date: Thu, 03 Mar 2005 11:37:04 +0000 Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers Message-Id: <20050303033704.6fb77a34.akpm@osdl.org> List-Id: References: <16923.193.128608.607599@jaguar.mkp.net> In-Reply-To: <16923.193.128608.607599@jaguar.mkp.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Jes Sorensen Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org jes@trained-monkey.org (Jes Sorensen) wrote: > > This patch introduces ia64 specific read/write handlers for /dev/mem > access which is needed to avoid uncached pages to be accessed through > the cached kernel window which can lead to random corruption. This patch causes hiccups on my ia32e box. linux:/home/akpm# /usr/sbin/hwscan --isapnp zsh: 7528 segmentation fault /usr/sbin/hwscan --isapnp linux:/home/akpm# /usr/sbin/hwscan --pci zsh: 7529 segmentation fault /usr/sbin/hwscan --pci linux:/home/akpm# /usr/sbin/hwscan --block zsh: 7530 segmentation fault /usr/sbin/hwscan --block linux:/home/akpm# /usr/sbin/hwscan --floppy zsh: 7533 segmentation fault /usr/sbin/hwscan --floppy strace ends with: open("/proc/apm", O_RDONLY) = -1 ENOENT (No such file or directory) open("/dev/mem", O_RDONLY) = 3 lseek(3, 1024, SEEK_SET) = 1024 read(3, 0x50a080, 256) = -1 EFAULT (Bad address) close(3) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++